Biennial plants may be kept alive (prevent their flowering) for several years by exposing them to - continuous warm temperatures - continuous cold temperatures - continuous short nights - continuous long nights

1. isogamy 1 organisms with gametes of the same size and shape 2. anisogamy organisms with gametes of different sizes and shapes 3. oogamy 2 organisms with gametes of the same shape but different sizes 4. gonads gamete-producing organs in lower plants 5. gametangia gamete-producing organs in animals